Discussions

In this experiment, we want to determine the porosity of core samples using one of the methods available which is Helium Porosimeter System. Basically, the Helium Porosimeter will saturate the core sample with billets in the matrix cup with Helium Gas and the result will be shown tabulated in the Computer System. Picture 1. Helium Porosimeter

First stage of the experiment is measuring the bulk volume. The bulk volume was calculated by measuring the diameter and the length of the core sample using Veniper callipers. The measurement was done three times to ensure each of the measurement was right and to prevent any mistake occurred.

Volume =r2h

= d2 h/4

Average Diameter : 36.92 mm

Then we put the billet after the core sample was put inside the matrix cup. We did that to fill the empty space still left in the matrix cup, we used billet number 5. We key in all of the measurement into the computer system and performed the experiment. The experiment was done for only 5 minutes. After the while, the data result appeared in the computer system and we're ready to calculate the porosity based on the data given.

Key- in Parameter

Core plug sample diameter, mm = (37.05 + 36.97 + 36.75)/3

= 36.92

Core plug sample length, mm = (57.77 + 57.74 + 57.89)/3

= 57.80

Core plug sample weight, g = (126.59 + 126.588 + 126.588)/3 = 126. 589

Filled up billets numbers

= 5

Data Result

Bulk volume cc

= 61.88

Grain volume cc

= 47.50

Pore volume cc

= 2.66

Grain density g/cc

= 23.24 % / 0.232

Based on the porosity table, the porosity of the core plug sample is considered very good ( 21% - 25%)

ErrorsThere were errors that might happened during the experiment and might caused in data inaccuracy and miscalculation of the result. 1. The experiment can only count effective porosity ( interconnected pores). We cannot determine the whole porosity due to possibility of isolated pores.

2. During the experiment, the matrix cup was filled with billet and core sample. There might be any empty spaces that still left in the matrix cup and therefore might caused different volume in calculation.

3. The empty space within the channel which releases the helium gas was also consider as error where there is possible of air flowing inside the pore.

4. Human errors also might happen, i.e. mistake at diameter and length measurement (wrong start, too tight or loose in measurement)Conclusions The porosity of the core plug sample can be determined by helium porosimeter with gas saturation method. Making sure that no empty space in the matrix cup is necessary to make the measurement more accurate.

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